root / block / qcow2.c @ 6d85a57e
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1 | 585f8587 | bellard | /*
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2 | 585f8587 | bellard | * Block driver for the QCOW version 2 format
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3 | 5fafdf24 | ths | *
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4 | 585f8587 | bellard | * Copyright (c) 2004-2006 Fabrice Bellard
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5 | 5fafdf24 | ths | *
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6 | 585f8587 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 585f8587 | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | 585f8587 | bellard | * in the Software without restriction, including without limitation the rights
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9 | 585f8587 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 585f8587 | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | 585f8587 | bellard | * furnished to do so, subject to the following conditions:
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12 | 585f8587 | bellard | *
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13 | 585f8587 | bellard | * The above copyright notice and this permission notice shall be included in
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14 | 585f8587 | bellard | * all copies or substantial portions of the Software.
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15 | 585f8587 | bellard | *
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16 | 585f8587 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 585f8587 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 585f8587 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 585f8587 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 585f8587 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 585f8587 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 585f8587 | bellard | * THE SOFTWARE.
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23 | 585f8587 | bellard | */
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24 | faf07963 | pbrook | #include "qemu-common.h" |
25 | 585f8587 | bellard | #include "block_int.h" |
26 | 5efa9d5a | Anthony Liguori | #include "module.h" |
27 | 585f8587 | bellard | #include <zlib.h> |
28 | 585f8587 | bellard | #include "aes.h" |
29 | f7d0fe02 | Kevin Wolf | #include "block/qcow2.h" |
30 | a9420734 | Kevin Wolf | #include "qemu-error.h" |
31 | 585f8587 | bellard | |
32 | 585f8587 | bellard | /*
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33 | 585f8587 | bellard | Differences with QCOW:
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34 | 585f8587 | bellard | |
35 | 585f8587 | bellard | - Support for multiple incremental snapshots.
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36 | 585f8587 | bellard | - Memory management by reference counts.
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37 | 585f8587 | bellard | - Clusters which have a reference count of one have the bit
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38 | 585f8587 | bellard | QCOW_OFLAG_COPIED to optimize write performance.
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39 | 5fafdf24 | ths | - Size of compressed clusters is stored in sectors to reduce bit usage
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40 | 585f8587 | bellard | in the cluster offsets.
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41 | 585f8587 | bellard | - Support for storing additional data (such as the VM state) in the
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42 | 3b46e624 | ths | snapshots.
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43 | 585f8587 | bellard | - If a backing store is used, the cluster size is not constrained
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44 | 585f8587 | bellard | (could be backported to QCOW).
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45 | 585f8587 | bellard | - L2 tables have always a size of one cluster.
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46 | 585f8587 | bellard | */
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47 | 585f8587 | bellard | |
48 | 9b80ddf3 | aliguori | |
49 | 9b80ddf3 | aliguori | typedef struct { |
50 | 9b80ddf3 | aliguori | uint32_t magic; |
51 | 9b80ddf3 | aliguori | uint32_t len; |
52 | 9b80ddf3 | aliguori | } QCowExtension; |
53 | 7c80ab3f | Jes Sorensen | #define QCOW2_EXT_MAGIC_END 0 |
54 | 7c80ab3f | Jes Sorensen | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA |
55 | 9b80ddf3 | aliguori | |
56 | 7c80ab3f | Jes Sorensen | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
57 | 585f8587 | bellard | { |
58 | 585f8587 | bellard | const QCowHeader *cow_header = (const void *)buf; |
59 | 3b46e624 | ths | |
60 | 585f8587 | bellard | if (buf_size >= sizeof(QCowHeader) && |
61 | 585f8587 | bellard | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
62 | 5fafdf24 | ths | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
63 | 585f8587 | bellard | return 100; |
64 | 585f8587 | bellard | else
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65 | 585f8587 | bellard | return 0; |
66 | 585f8587 | bellard | } |
67 | 585f8587 | bellard | |
68 | 9b80ddf3 | aliguori | |
69 | 9b80ddf3 | aliguori | /*
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70 | 9b80ddf3 | aliguori | * read qcow2 extension and fill bs
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71 | 9b80ddf3 | aliguori | * start reading from start_offset
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72 | 9b80ddf3 | aliguori | * finish reading upon magic of value 0 or when end_offset reached
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73 | 9b80ddf3 | aliguori | * unknown magic is skipped (future extension this version knows nothing about)
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74 | 9b80ddf3 | aliguori | * return 0 upon success, non-0 otherwise
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75 | 9b80ddf3 | aliguori | */
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76 | 7c80ab3f | Jes Sorensen | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
77 | 7c80ab3f | Jes Sorensen | uint64_t end_offset) |
78 | 9b80ddf3 | aliguori | { |
79 | 9b80ddf3 | aliguori | QCowExtension ext; |
80 | 9b80ddf3 | aliguori | uint64_t offset; |
81 | 9b80ddf3 | aliguori | |
82 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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83 | 7c80ab3f | Jes Sorensen | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
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84 | 9b80ddf3 | aliguori | #endif
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85 | 9b80ddf3 | aliguori | offset = start_offset; |
86 | 9b80ddf3 | aliguori | while (offset < end_offset) {
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87 | 9b80ddf3 | aliguori | |
88 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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89 | 9b80ddf3 | aliguori | /* Sanity check */
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90 | 9b80ddf3 | aliguori | if (offset > s->cluster_size)
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91 | 7c80ab3f | Jes Sorensen | printf("qcow2_read_extension: suspicious offset %lu\n", offset);
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92 | 9b80ddf3 | aliguori | |
93 | 9b80ddf3 | aliguori | printf("attemting to read extended header in offset %lu\n", offset);
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94 | 9b80ddf3 | aliguori | #endif
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95 | 9b80ddf3 | aliguori | |
96 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
97 | 7c80ab3f | Jes Sorensen | fprintf(stderr, "qcow2_read_extension: ERROR: "
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98 | 0bfcd599 | Blue Swirl | "pread fail from offset %" PRIu64 "\n", |
99 | 0bfcd599 | Blue Swirl | offset); |
100 | 9b80ddf3 | aliguori | return 1; |
101 | 9b80ddf3 | aliguori | } |
102 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.magic); |
103 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.len); |
104 | 9b80ddf3 | aliguori | offset += sizeof(ext);
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105 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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106 | 9b80ddf3 | aliguori | printf("ext.magic = 0x%x\n", ext.magic);
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107 | 9b80ddf3 | aliguori | #endif
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108 | 9b80ddf3 | aliguori | switch (ext.magic) {
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109 | 7c80ab3f | Jes Sorensen | case QCOW2_EXT_MAGIC_END:
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110 | 9b80ddf3 | aliguori | return 0; |
111 | f965509c | aliguori | |
112 | 7c80ab3f | Jes Sorensen | case QCOW2_EXT_MAGIC_BACKING_FORMAT:
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113 | f965509c | aliguori | if (ext.len >= sizeof(bs->backing_format)) { |
114 | f965509c | aliguori | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large"
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115 | 4c978075 | aliguori | " (>=%zu)\n",
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116 | f965509c | aliguori | ext.len, sizeof(bs->backing_format));
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117 | f965509c | aliguori | return 2; |
118 | f965509c | aliguori | } |
119 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, offset , bs->backing_format,
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120 | f965509c | aliguori | ext.len) != ext.len) |
121 | f965509c | aliguori | return 3; |
122 | f965509c | aliguori | bs->backing_format[ext.len] = '\0';
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123 | f965509c | aliguori | #ifdef DEBUG_EXT
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124 | f965509c | aliguori | printf("Qcow2: Got format extension %s\n", bs->backing_format);
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125 | f965509c | aliguori | #endif
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126 | e1c7f0e3 | Kevin Wolf | offset = ((offset + ext.len + 7) & ~7); |
127 | f965509c | aliguori | break;
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128 | f965509c | aliguori | |
129 | 9b80ddf3 | aliguori | default:
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130 | 9b80ddf3 | aliguori | /* unknown magic -- just skip it */
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131 | e1c7f0e3 | Kevin Wolf | offset = ((offset + ext.len + 7) & ~7); |
132 | 9b80ddf3 | aliguori | break;
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133 | 9b80ddf3 | aliguori | } |
134 | 9b80ddf3 | aliguori | } |
135 | 9b80ddf3 | aliguori | |
136 | 9b80ddf3 | aliguori | return 0; |
137 | 9b80ddf3 | aliguori | } |
138 | 9b80ddf3 | aliguori | |
139 | 9b80ddf3 | aliguori | |
140 | 7c80ab3f | Jes Sorensen | static int qcow2_open(BlockDriverState *bs, int flags) |
141 | 585f8587 | bellard | { |
142 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
143 | 6d85a57e | Jes Sorensen | int len, i, ret = 0; |
144 | 585f8587 | bellard | QCowHeader header; |
145 | 9b80ddf3 | aliguori | uint64_t ext_end; |
146 | 585f8587 | bellard | |
147 | 6d85a57e | Jes Sorensen | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
148 | 6d85a57e | Jes Sorensen | if (ret < 0) { |
149 | 585f8587 | bellard | goto fail;
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150 | 6d85a57e | Jes Sorensen | } |
151 | 585f8587 | bellard | be32_to_cpus(&header.magic); |
152 | 585f8587 | bellard | be32_to_cpus(&header.version); |
153 | 585f8587 | bellard | be64_to_cpus(&header.backing_file_offset); |
154 | 585f8587 | bellard | be32_to_cpus(&header.backing_file_size); |
155 | 585f8587 | bellard | be64_to_cpus(&header.size); |
156 | 585f8587 | bellard | be32_to_cpus(&header.cluster_bits); |
157 | 585f8587 | bellard | be32_to_cpus(&header.crypt_method); |
158 | 585f8587 | bellard | be64_to_cpus(&header.l1_table_offset); |
159 | 585f8587 | bellard | be32_to_cpus(&header.l1_size); |
160 | 585f8587 | bellard | be64_to_cpus(&header.refcount_table_offset); |
161 | 585f8587 | bellard | be32_to_cpus(&header.refcount_table_clusters); |
162 | 585f8587 | bellard | be64_to_cpus(&header.snapshots_offset); |
163 | 585f8587 | bellard | be32_to_cpus(&header.nb_snapshots); |
164 | 3b46e624 | ths | |
165 | 6d85a57e | Jes Sorensen | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION) {
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166 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
167 | 585f8587 | bellard | goto fail;
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168 | 6d85a57e | Jes Sorensen | } |
169 | d191d12d | Stefan Weil | if (header.cluster_bits < MIN_CLUSTER_BITS ||
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170 | 6d85a57e | Jes Sorensen | header.cluster_bits > MAX_CLUSTER_BITS) { |
171 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
172 | 585f8587 | bellard | goto fail;
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173 | 6d85a57e | Jes Sorensen | } |
174 | 6d85a57e | Jes Sorensen | if (header.crypt_method > QCOW_CRYPT_AES) {
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175 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
176 | 585f8587 | bellard | goto fail;
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177 | 6d85a57e | Jes Sorensen | } |
178 | 585f8587 | bellard | s->crypt_method_header = header.crypt_method; |
179 | 6d85a57e | Jes Sorensen | if (s->crypt_method_header) {
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180 | 585f8587 | bellard | bs->encrypted = 1;
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181 | 6d85a57e | Jes Sorensen | } |
182 | 585f8587 | bellard | s->cluster_bits = header.cluster_bits; |
183 | 585f8587 | bellard | s->cluster_size = 1 << s->cluster_bits;
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184 | 585f8587 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
185 | 585f8587 | bellard | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
186 | 585f8587 | bellard | s->l2_size = 1 << s->l2_bits;
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187 | 585f8587 | bellard | bs->total_sectors = header.size / 512;
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188 | 585f8587 | bellard | s->csize_shift = (62 - (s->cluster_bits - 8)); |
189 | 585f8587 | bellard | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; |
190 | 585f8587 | bellard | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; |
191 | 585f8587 | bellard | s->refcount_table_offset = header.refcount_table_offset; |
192 | 5fafdf24 | ths | s->refcount_table_size = |
193 | 585f8587 | bellard | header.refcount_table_clusters << (s->cluster_bits - 3);
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194 | 585f8587 | bellard | |
195 | 585f8587 | bellard | s->snapshots_offset = header.snapshots_offset; |
196 | 585f8587 | bellard | s->nb_snapshots = header.nb_snapshots; |
197 | 585f8587 | bellard | |
198 | 585f8587 | bellard | /* read the level 1 table */
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199 | 585f8587 | bellard | s->l1_size = header.l1_size; |
200 | 419b19d9 | Stefan Hajnoczi | s->l1_vm_state_index = size_to_l1(s, header.size); |
201 | 585f8587 | bellard | /* the L1 table must contain at least enough entries to put
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202 | 585f8587 | bellard | header.size bytes */
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203 | 6d85a57e | Jes Sorensen | if (s->l1_size < s->l1_vm_state_index) {
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204 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
205 | 585f8587 | bellard | goto fail;
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206 | 6d85a57e | Jes Sorensen | } |
207 | 585f8587 | bellard | s->l1_table_offset = header.l1_table_offset; |
208 | d191d12d | Stefan Weil | if (s->l1_size > 0) { |
209 | d191d12d | Stefan Weil | s->l1_table = qemu_mallocz( |
210 | d191d12d | Stefan Weil | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
211 | 6d85a57e | Jes Sorensen | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
212 | 6d85a57e | Jes Sorensen | s->l1_size * sizeof(uint64_t));
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213 | 6d85a57e | Jes Sorensen | if (ret < 0) { |
214 | d191d12d | Stefan Weil | goto fail;
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215 | 6d85a57e | Jes Sorensen | } |
216 | d191d12d | Stefan Weil | for(i = 0;i < s->l1_size; i++) { |
217 | d191d12d | Stefan Weil | be64_to_cpus(&s->l1_table[i]); |
218 | d191d12d | Stefan Weil | } |
219 | 585f8587 | bellard | } |
220 | 585f8587 | bellard | /* alloc L2 cache */
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221 | 585f8587 | bellard | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
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222 | 585f8587 | bellard | s->cluster_cache = qemu_malloc(s->cluster_size); |
223 | 585f8587 | bellard | /* one more sector for decompressed data alignment */
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224 | 095a9c58 | aliguori | s->cluster_data = qemu_malloc(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
225 | 095a9c58 | aliguori | + 512);
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226 | 585f8587 | bellard | s->cluster_cache_offset = -1;
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227 | 3b46e624 | ths | |
228 | 6d85a57e | Jes Sorensen | ret = qcow2_refcount_init(bs); |
229 | 6d85a57e | Jes Sorensen | if (ret != 0) { |
230 | 585f8587 | bellard | goto fail;
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231 | 6d85a57e | Jes Sorensen | } |
232 | 585f8587 | bellard | |
233 | 72cf2d4f | Blue Swirl | QLIST_INIT(&s->cluster_allocs); |
234 | f214978a | Kevin Wolf | |
235 | 9b80ddf3 | aliguori | /* read qcow2 extensions */
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236 | 6d85a57e | Jes Sorensen | if (header.backing_file_offset) {
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237 | 9b80ddf3 | aliguori | ext_end = header.backing_file_offset; |
238 | 6d85a57e | Jes Sorensen | } else {
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239 | 9b80ddf3 | aliguori | ext_end = s->cluster_size; |
240 | 6d85a57e | Jes Sorensen | } |
241 | 6d85a57e | Jes Sorensen | if (qcow2_read_extensions(bs, sizeof(header), ext_end)) { |
242 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
243 | 9b80ddf3 | aliguori | goto fail;
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244 | 6d85a57e | Jes Sorensen | } |
245 | 9b80ddf3 | aliguori | |
246 | 585f8587 | bellard | /* read the backing file name */
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247 | 585f8587 | bellard | if (header.backing_file_offset != 0) { |
248 | 585f8587 | bellard | len = header.backing_file_size; |
249 | 6d85a57e | Jes Sorensen | if (len > 1023) { |
250 | 585f8587 | bellard | len = 1023;
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251 | 6d85a57e | Jes Sorensen | } |
252 | 6d85a57e | Jes Sorensen | ret = bdrv_pread(bs->file, header.backing_file_offset, |
253 | 6d85a57e | Jes Sorensen | bs->backing_file, len); |
254 | 6d85a57e | Jes Sorensen | if (ret < 0) { |
255 | 585f8587 | bellard | goto fail;
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256 | 6d85a57e | Jes Sorensen | } |
257 | 585f8587 | bellard | bs->backing_file[len] = '\0';
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258 | 585f8587 | bellard | } |
259 | 6d85a57e | Jes Sorensen | if (qcow2_read_snapshots(bs) < 0) { |
260 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
261 | 585f8587 | bellard | goto fail;
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262 | 6d85a57e | Jes Sorensen | } |
263 | 585f8587 | bellard | |
264 | 585f8587 | bellard | #ifdef DEBUG_ALLOC
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265 | 14899cdf | Filip Navara | qcow2_check_refcounts(bs); |
266 | 585f8587 | bellard | #endif
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267 | 6d85a57e | Jes Sorensen | return ret;
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268 | 585f8587 | bellard | |
269 | 585f8587 | bellard | fail:
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270 | ed6ccf0f | Kevin Wolf | qcow2_free_snapshots(bs); |
271 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
272 | 585f8587 | bellard | qemu_free(s->l1_table); |
273 | 585f8587 | bellard | qemu_free(s->l2_cache); |
274 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
275 | 585f8587 | bellard | qemu_free(s->cluster_data); |
276 | 6d85a57e | Jes Sorensen | return ret;
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277 | 585f8587 | bellard | } |
278 | 585f8587 | bellard | |
279 | 7c80ab3f | Jes Sorensen | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
280 | 585f8587 | bellard | { |
281 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
282 | 585f8587 | bellard | uint8_t keybuf[16];
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283 | 585f8587 | bellard | int len, i;
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284 | 3b46e624 | ths | |
285 | 585f8587 | bellard | memset(keybuf, 0, 16); |
286 | 585f8587 | bellard | len = strlen(key); |
287 | 585f8587 | bellard | if (len > 16) |
288 | 585f8587 | bellard | len = 16;
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289 | 585f8587 | bellard | /* XXX: we could compress the chars to 7 bits to increase
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290 | 585f8587 | bellard | entropy */
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291 | 585f8587 | bellard | for(i = 0;i < len;i++) { |
292 | 585f8587 | bellard | keybuf[i] = key[i]; |
293 | 585f8587 | bellard | } |
294 | 585f8587 | bellard | s->crypt_method = s->crypt_method_header; |
295 | 585f8587 | bellard | |
296 | 585f8587 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
297 | 585f8587 | bellard | return -1; |
298 | 585f8587 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
299 | 585f8587 | bellard | return -1; |
300 | 585f8587 | bellard | #if 0
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301 | 585f8587 | bellard | /* test */
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302 | 585f8587 | bellard | {
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303 | 585f8587 | bellard | uint8_t in[16];
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304 | 585f8587 | bellard | uint8_t out[16];
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305 | 585f8587 | bellard | uint8_t tmp[16];
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306 | 585f8587 | bellard | for(i=0;i<16;i++)
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307 | 585f8587 | bellard | in[i] = i;
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308 | 585f8587 | bellard | AES_encrypt(in, tmp, &s->aes_encrypt_key);
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309 | 585f8587 | bellard | AES_decrypt(tmp, out, &s->aes_decrypt_key);
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310 | 585f8587 | bellard | for(i = 0; i < 16; i++)
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311 | 585f8587 | bellard | printf(" %02x", tmp[i]);
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312 | 585f8587 | bellard | printf("\n");
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313 | 585f8587 | bellard | for(i = 0; i < 16; i++)
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314 | 585f8587 | bellard | printf(" %02x", out[i]);
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315 | 585f8587 | bellard | printf("\n");
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316 | 585f8587 | bellard | }
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317 | 585f8587 | bellard | #endif
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318 | 585f8587 | bellard | return 0; |
319 | 585f8587 | bellard | } |
320 | 585f8587 | bellard | |
321 | 7c80ab3f | Jes Sorensen | static int qcow2_is_allocated(BlockDriverState *bs, int64_t sector_num, |
322 | 7c80ab3f | Jes Sorensen | int nb_sectors, int *pnum) |
323 | 585f8587 | bellard | { |
324 | 585f8587 | bellard | uint64_t cluster_offset; |
325 | 1c46efaa | Kevin Wolf | int ret;
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326 | 585f8587 | bellard | |
327 | 095a9c58 | aliguori | *pnum = nb_sectors; |
328 | 1c46efaa | Kevin Wolf | /* FIXME We can get errors here, but the bdrv_is_allocated interface can't
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329 | 1c46efaa | Kevin Wolf | * pass them on today */
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330 | 1c46efaa | Kevin Wolf | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset);
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331 | 1c46efaa | Kevin Wolf | if (ret < 0) { |
332 | 1c46efaa | Kevin Wolf | *pnum = 0;
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333 | 1c46efaa | Kevin Wolf | } |
334 | 095a9c58 | aliguori | |
335 | 585f8587 | bellard | return (cluster_offset != 0); |
336 | 585f8587 | bellard | } |
337 | 585f8587 | bellard | |
338 | a9465922 | bellard | /* handle reading after the end of the backing file */
|
339 | bd28f835 | Kevin Wolf | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
|
340 | bd28f835 | Kevin Wolf | int64_t sector_num, int nb_sectors)
|
341 | a9465922 | bellard | { |
342 | a9465922 | bellard | int n1;
|
343 | a9465922 | bellard | if ((sector_num + nb_sectors) <= bs->total_sectors)
|
344 | a9465922 | bellard | return nb_sectors;
|
345 | a9465922 | bellard | if (sector_num >= bs->total_sectors)
|
346 | a9465922 | bellard | n1 = 0;
|
347 | a9465922 | bellard | else
|
348 | a9465922 | bellard | n1 = bs->total_sectors - sector_num; |
349 | bd28f835 | Kevin Wolf | |
350 | bd28f835 | Kevin Wolf | qemu_iovec_memset(qiov, 0, 512 * (nb_sectors - n1)); |
351 | bd28f835 | Kevin Wolf | |
352 | a9465922 | bellard | return n1;
|
353 | a9465922 | bellard | } |
354 | a9465922 | bellard | |
355 | ce1a14dc | pbrook | typedef struct QCowAIOCB { |
356 | ce1a14dc | pbrook | BlockDriverAIOCB common; |
357 | 585f8587 | bellard | int64_t sector_num; |
358 | f141eafe | aliguori | QEMUIOVector *qiov; |
359 | 7b88e48b | Christoph Hellwig | int remaining_sectors;
|
360 | 7b88e48b | Christoph Hellwig | int cur_nr_sectors; /* number of sectors in current iteration */ |
361 | bd28f835 | Kevin Wolf | uint64_t bytes_done; |
362 | 585f8587 | bellard | uint64_t cluster_offset; |
363 | 5fafdf24 | ths | uint8_t *cluster_data; |
364 | 585f8587 | bellard | BlockDriverAIOCB *hd_aiocb; |
365 | c87c0672 | aliguori | QEMUIOVector hd_qiov; |
366 | 1490791f | aliguori | QEMUBH *bh; |
367 | e976c6a1 | aliguori | QCowL2Meta l2meta; |
368 | 72cf2d4f | Blue Swirl | QLIST_ENTRY(QCowAIOCB) next_depend; |
369 | 585f8587 | bellard | } QCowAIOCB; |
370 | 585f8587 | bellard | |
371 | 7c80ab3f | Jes Sorensen | static void qcow2_aio_cancel(BlockDriverAIOCB *blockacb) |
372 | c16b5a2c | Christoph Hellwig | { |
373 | b666d239 | Kevin Wolf | QCowAIOCB *acb = container_of(blockacb, QCowAIOCB, common); |
374 | c16b5a2c | Christoph Hellwig | if (acb->hd_aiocb)
|
375 | c16b5a2c | Christoph Hellwig | bdrv_aio_cancel(acb->hd_aiocb); |
376 | c16b5a2c | Christoph Hellwig | qemu_aio_release(acb); |
377 | c16b5a2c | Christoph Hellwig | } |
378 | c16b5a2c | Christoph Hellwig | |
379 | 7c80ab3f | Jes Sorensen | static AIOPool qcow2_aio_pool = {
|
380 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(QCowAIOCB),
|
381 | 7c80ab3f | Jes Sorensen | .cancel = qcow2_aio_cancel, |
382 | c16b5a2c | Christoph Hellwig | }; |
383 | c16b5a2c | Christoph Hellwig | |
384 | 7c80ab3f | Jes Sorensen | static void qcow2_aio_read_cb(void *opaque, int ret); |
385 | 7c80ab3f | Jes Sorensen | static void qcow2_aio_read_bh(void *opaque) |
386 | 1490791f | aliguori | { |
387 | 1490791f | aliguori | QCowAIOCB *acb = opaque; |
388 | 1490791f | aliguori | qemu_bh_delete(acb->bh); |
389 | 1490791f | aliguori | acb->bh = NULL;
|
390 | 7c80ab3f | Jes Sorensen | qcow2_aio_read_cb(opaque, 0);
|
391 | 1490791f | aliguori | } |
392 | 1490791f | aliguori | |
393 | 7c80ab3f | Jes Sorensen | static int qcow2_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb) |
394 | a32ef786 | aliguori | { |
395 | a32ef786 | aliguori | if (acb->bh)
|
396 | a32ef786 | aliguori | return -EIO;
|
397 | a32ef786 | aliguori | |
398 | a32ef786 | aliguori | acb->bh = qemu_bh_new(cb, acb); |
399 | a32ef786 | aliguori | if (!acb->bh)
|
400 | a32ef786 | aliguori | return -EIO;
|
401 | a32ef786 | aliguori | |
402 | a32ef786 | aliguori | qemu_bh_schedule(acb->bh); |
403 | a32ef786 | aliguori | |
404 | a32ef786 | aliguori | return 0; |
405 | a32ef786 | aliguori | } |
406 | a32ef786 | aliguori | |
407 | 7c80ab3f | Jes Sorensen | static void qcow2_aio_read_cb(void *opaque, int ret) |
408 | 585f8587 | bellard | { |
409 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
410 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
411 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
412 | a9465922 | bellard | int index_in_cluster, n1;
|
413 | 585f8587 | bellard | |
414 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
415 | f141eafe | aliguori | if (ret < 0) |
416 | f141eafe | aliguori | goto done;
|
417 | 585f8587 | bellard | |
418 | 585f8587 | bellard | /* post process the read buffer */
|
419 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
420 | 585f8587 | bellard | /* nothing to do */
|
421 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
422 | 585f8587 | bellard | /* nothing to do */
|
423 | 585f8587 | bellard | } else {
|
424 | 585f8587 | bellard | if (s->crypt_method) {
|
425 | bd28f835 | Kevin Wolf | qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data, |
426 | bd28f835 | Kevin Wolf | acb->cluster_data, acb->cur_nr_sectors, 0, &s->aes_decrypt_key);
|
427 | bd28f835 | Kevin Wolf | qemu_iovec_reset(&acb->hd_qiov); |
428 | bd28f835 | Kevin Wolf | qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done, |
429 | bd28f835 | Kevin Wolf | acb->cur_nr_sectors * 512);
|
430 | bd28f835 | Kevin Wolf | qemu_iovec_from_buffer(&acb->hd_qiov, acb->cluster_data, |
431 | bd28f835 | Kevin Wolf | 512 * acb->cur_nr_sectors);
|
432 | 585f8587 | bellard | } |
433 | 585f8587 | bellard | } |
434 | 585f8587 | bellard | |
435 | 7b88e48b | Christoph Hellwig | acb->remaining_sectors -= acb->cur_nr_sectors; |
436 | 7b88e48b | Christoph Hellwig | acb->sector_num += acb->cur_nr_sectors; |
437 | bd28f835 | Kevin Wolf | acb->bytes_done += acb->cur_nr_sectors * 512;
|
438 | 585f8587 | bellard | |
439 | 7b88e48b | Christoph Hellwig | if (acb->remaining_sectors == 0) { |
440 | 585f8587 | bellard | /* request completed */
|
441 | f141eafe | aliguori | ret = 0;
|
442 | f141eafe | aliguori | goto done;
|
443 | 585f8587 | bellard | } |
444 | 3b46e624 | ths | |
445 | 585f8587 | bellard | /* prepare next AIO request */
|
446 | 7b88e48b | Christoph Hellwig | acb->cur_nr_sectors = acb->remaining_sectors; |
447 | bd28f835 | Kevin Wolf | if (s->crypt_method) {
|
448 | bd28f835 | Kevin Wolf | acb->cur_nr_sectors = MIN(acb->cur_nr_sectors, |
449 | bd28f835 | Kevin Wolf | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); |
450 | bd28f835 | Kevin Wolf | } |
451 | bd28f835 | Kevin Wolf | |
452 | 1c46efaa | Kevin Wolf | ret = qcow2_get_cluster_offset(bs, acb->sector_num << 9,
|
453 | 1c46efaa | Kevin Wolf | &acb->cur_nr_sectors, &acb->cluster_offset); |
454 | 1c46efaa | Kevin Wolf | if (ret < 0) { |
455 | 1c46efaa | Kevin Wolf | goto done;
|
456 | 1c46efaa | Kevin Wolf | } |
457 | 1c46efaa | Kevin Wolf | |
458 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
459 | ce1a14dc | pbrook | |
460 | bd28f835 | Kevin Wolf | qemu_iovec_reset(&acb->hd_qiov); |
461 | bd28f835 | Kevin Wolf | qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done, |
462 | bd28f835 | Kevin Wolf | acb->cur_nr_sectors * 512);
|
463 | bd28f835 | Kevin Wolf | |
464 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
465 | bd28f835 | Kevin Wolf | |
466 | 585f8587 | bellard | if (bs->backing_hd) {
|
467 | 585f8587 | bellard | /* read from the base image */
|
468 | bd28f835 | Kevin Wolf | n1 = qcow2_backing_read1(bs->backing_hd, &acb->hd_qiov, |
469 | bd28f835 | Kevin Wolf | acb->sector_num, acb->cur_nr_sectors); |
470 | a9465922 | bellard | if (n1 > 0) { |
471 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
472 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num, |
473 | 7b88e48b | Christoph Hellwig | &acb->hd_qiov, acb->cur_nr_sectors, |
474 | 7c80ab3f | Jes Sorensen | qcow2_aio_read_cb, acb); |
475 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
476 | f141eafe | aliguori | goto done;
|
477 | a9465922 | bellard | } else {
|
478 | 7c80ab3f | Jes Sorensen | ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb); |
479 | a32ef786 | aliguori | if (ret < 0) |
480 | f141eafe | aliguori | goto done;
|
481 | a9465922 | bellard | } |
482 | 585f8587 | bellard | } else {
|
483 | 585f8587 | bellard | /* Note: in this case, no need to wait */
|
484 | bd28f835 | Kevin Wolf | qemu_iovec_memset(&acb->hd_qiov, 0, 512 * acb->cur_nr_sectors); |
485 | 7c80ab3f | Jes Sorensen | ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb); |
486 | a32ef786 | aliguori | if (ret < 0) |
487 | f141eafe | aliguori | goto done;
|
488 | 585f8587 | bellard | } |
489 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
490 | 585f8587 | bellard | /* add AIO support for compressed blocks ? */
|
491 | 66f82cee | Kevin Wolf | if (qcow2_decompress_cluster(bs, acb->cluster_offset) < 0) |
492 | f141eafe | aliguori | goto done;
|
493 | bd28f835 | Kevin Wolf | |
494 | bd28f835 | Kevin Wolf | qemu_iovec_from_buffer(&acb->hd_qiov, |
495 | bd28f835 | Kevin Wolf | s->cluster_cache + index_in_cluster * 512,
|
496 | bd28f835 | Kevin Wolf | 512 * acb->cur_nr_sectors);
|
497 | bd28f835 | Kevin Wolf | |
498 | 7c80ab3f | Jes Sorensen | ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb); |
499 | a32ef786 | aliguori | if (ret < 0) |
500 | f141eafe | aliguori | goto done;
|
501 | 585f8587 | bellard | } else {
|
502 | ce1a14dc | pbrook | if ((acb->cluster_offset & 511) != 0) { |
503 | 585f8587 | bellard | ret = -EIO; |
504 | f141eafe | aliguori | goto done;
|
505 | 585f8587 | bellard | } |
506 | c87c0672 | aliguori | |
507 | bd28f835 | Kevin Wolf | if (s->crypt_method) {
|
508 | bd28f835 | Kevin Wolf | /*
|
509 | bd28f835 | Kevin Wolf | * For encrypted images, read everything into a temporary
|
510 | bd28f835 | Kevin Wolf | * contiguous buffer on which the AES functions can work.
|
511 | bd28f835 | Kevin Wolf | */
|
512 | bd28f835 | Kevin Wolf | if (!acb->cluster_data) {
|
513 | bd28f835 | Kevin Wolf | acb->cluster_data = |
514 | bd28f835 | Kevin Wolf | qemu_mallocz(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
515 | bd28f835 | Kevin Wolf | } |
516 | bd28f835 | Kevin Wolf | |
517 | bd28f835 | Kevin Wolf | assert(acb->cur_nr_sectors <= |
518 | bd28f835 | Kevin Wolf | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); |
519 | bd28f835 | Kevin Wolf | qemu_iovec_reset(&acb->hd_qiov); |
520 | bd28f835 | Kevin Wolf | qemu_iovec_add(&acb->hd_qiov, acb->cluster_data, |
521 | bd28f835 | Kevin Wolf | 512 * acb->cur_nr_sectors);
|
522 | bd28f835 | Kevin Wolf | } |
523 | bd28f835 | Kevin Wolf | |
524 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
525 | 66f82cee | Kevin Wolf | acb->hd_aiocb = bdrv_aio_readv(bs->file, |
526 | 5fafdf24 | ths | (acb->cluster_offset >> 9) + index_in_cluster,
|
527 | 7b88e48b | Christoph Hellwig | &acb->hd_qiov, acb->cur_nr_sectors, |
528 | 7c80ab3f | Jes Sorensen | qcow2_aio_read_cb, acb); |
529 | 171e3d6b | Kevin Wolf | if (acb->hd_aiocb == NULL) { |
530 | 171e3d6b | Kevin Wolf | ret = -EIO; |
531 | f141eafe | aliguori | goto done;
|
532 | 171e3d6b | Kevin Wolf | } |
533 | f141eafe | aliguori | } |
534 | f141eafe | aliguori | |
535 | f141eafe | aliguori | return;
|
536 | f141eafe | aliguori | done:
|
537 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
538 | bd28f835 | Kevin Wolf | qemu_iovec_destroy(&acb->hd_qiov); |
539 | f141eafe | aliguori | qemu_aio_release(acb); |
540 | 585f8587 | bellard | } |
541 | 585f8587 | bellard | |
542 | 7c80ab3f | Jes Sorensen | static QCowAIOCB *qcow2_aio_setup(BlockDriverState *bs, int64_t sector_num,
|
543 | 7c80ab3f | Jes Sorensen | QEMUIOVector *qiov, int nb_sectors,
|
544 | 7c80ab3f | Jes Sorensen | BlockDriverCompletionFunc *cb, |
545 | 7c80ab3f | Jes Sorensen | void *opaque, int is_write) |
546 | 585f8587 | bellard | { |
547 | ce1a14dc | pbrook | QCowAIOCB *acb; |
548 | ce1a14dc | pbrook | |
549 | 7c80ab3f | Jes Sorensen | acb = qemu_aio_get(&qcow2_aio_pool, bs, cb, opaque); |
550 | ce1a14dc | pbrook | if (!acb)
|
551 | ce1a14dc | pbrook | return NULL; |
552 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
553 | ce1a14dc | pbrook | acb->sector_num = sector_num; |
554 | f141eafe | aliguori | acb->qiov = qiov; |
555 | bd28f835 | Kevin Wolf | |
556 | 6f5f060b | Kevin Wolf | qemu_iovec_init(&acb->hd_qiov, qiov->niov); |
557 | bd28f835 | Kevin Wolf | |
558 | bd28f835 | Kevin Wolf | acb->bytes_done = 0;
|
559 | 7b88e48b | Christoph Hellwig | acb->remaining_sectors = nb_sectors; |
560 | 7b88e48b | Christoph Hellwig | acb->cur_nr_sectors = 0;
|
561 | ce1a14dc | pbrook | acb->cluster_offset = 0;
|
562 | e976c6a1 | aliguori | acb->l2meta.nb_clusters = 0;
|
563 | 72cf2d4f | Blue Swirl | QLIST_INIT(&acb->l2meta.dependent_requests); |
564 | ce1a14dc | pbrook | return acb;
|
565 | ce1a14dc | pbrook | } |
566 | ce1a14dc | pbrook | |
567 | 7c80ab3f | Jes Sorensen | static BlockDriverAIOCB *qcow2_aio_readv(BlockDriverState *bs,
|
568 | 7c80ab3f | Jes Sorensen | int64_t sector_num, |
569 | 7c80ab3f | Jes Sorensen | QEMUIOVector *qiov, int nb_sectors,
|
570 | 7c80ab3f | Jes Sorensen | BlockDriverCompletionFunc *cb, |
571 | 7c80ab3f | Jes Sorensen | void *opaque)
|
572 | ce1a14dc | pbrook | { |
573 | ce1a14dc | pbrook | QCowAIOCB *acb; |
574 | ce1a14dc | pbrook | |
575 | 7c80ab3f | Jes Sorensen | acb = qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
576 | ce1a14dc | pbrook | if (!acb)
|
577 | ce1a14dc | pbrook | return NULL; |
578 | 585f8587 | bellard | |
579 | 7c80ab3f | Jes Sorensen | qcow2_aio_read_cb(acb, 0);
|
580 | ce1a14dc | pbrook | return &acb->common;
|
581 | 585f8587 | bellard | } |
582 | 585f8587 | bellard | |
583 | 7c80ab3f | Jes Sorensen | static void qcow2_aio_write_cb(void *opaque, int ret); |
584 | f214978a | Kevin Wolf | |
585 | f214978a | Kevin Wolf | static void run_dependent_requests(QCowL2Meta *m) |
586 | f214978a | Kevin Wolf | { |
587 | f214978a | Kevin Wolf | QCowAIOCB *req; |
588 | f214978a | Kevin Wolf | QCowAIOCB *next; |
589 | f214978a | Kevin Wolf | |
590 | f214978a | Kevin Wolf | /* Take the request off the list of running requests */
|
591 | f214978a | Kevin Wolf | if (m->nb_clusters != 0) { |
592 | 72cf2d4f | Blue Swirl | QLIST_REMOVE(m, next_in_flight); |
593 | f214978a | Kevin Wolf | } |
594 | f214978a | Kevin Wolf | |
595 | d4c146f0 | Stefan Hajnoczi | /* Restart all dependent requests */
|
596 | d4c146f0 | Stefan Hajnoczi | QLIST_FOREACH_SAFE(req, &m->dependent_requests, next_depend, next) { |
597 | 7c80ab3f | Jes Sorensen | qcow2_aio_write_cb(req, 0);
|
598 | f214978a | Kevin Wolf | } |
599 | f214978a | Kevin Wolf | |
600 | f214978a | Kevin Wolf | /* Empty the list for the next part of the request */
|
601 | 72cf2d4f | Blue Swirl | QLIST_INIT(&m->dependent_requests); |
602 | f214978a | Kevin Wolf | } |
603 | f214978a | Kevin Wolf | |
604 | 7c80ab3f | Jes Sorensen | static void qcow2_aio_write_cb(void *opaque, int ret) |
605 | 585f8587 | bellard | { |
606 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
607 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
608 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
609 | 585f8587 | bellard | int index_in_cluster;
|
610 | 095a9c58 | aliguori | int n_end;
|
611 | ce1a14dc | pbrook | |
612 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
613 | ce1a14dc | pbrook | |
614 | f214978a | Kevin Wolf | if (ret >= 0) { |
615 | 148da7ea | Kevin Wolf | ret = qcow2_alloc_cluster_link_l2(bs, &acb->l2meta); |
616 | f214978a | Kevin Wolf | } |
617 | f214978a | Kevin Wolf | |
618 | f214978a | Kevin Wolf | run_dependent_requests(&acb->l2meta); |
619 | f214978a | Kevin Wolf | |
620 | f141eafe | aliguori | if (ret < 0) |
621 | f141eafe | aliguori | goto done;
|
622 | 585f8587 | bellard | |
623 | 7b88e48b | Christoph Hellwig | acb->remaining_sectors -= acb->cur_nr_sectors; |
624 | 7b88e48b | Christoph Hellwig | acb->sector_num += acb->cur_nr_sectors; |
625 | 6f5f060b | Kevin Wolf | acb->bytes_done += acb->cur_nr_sectors * 512;
|
626 | 585f8587 | bellard | |
627 | 7b88e48b | Christoph Hellwig | if (acb->remaining_sectors == 0) { |
628 | 585f8587 | bellard | /* request completed */
|
629 | f141eafe | aliguori | ret = 0;
|
630 | f141eafe | aliguori | goto done;
|
631 | 585f8587 | bellard | } |
632 | 3b46e624 | ths | |
633 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
634 | 7b88e48b | Christoph Hellwig | n_end = index_in_cluster + acb->remaining_sectors; |
635 | 095a9c58 | aliguori | if (s->crypt_method &&
|
636 | 095a9c58 | aliguori | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) |
637 | 095a9c58 | aliguori | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; |
638 | 095a9c58 | aliguori | |
639 | 148da7ea | Kevin Wolf | ret = qcow2_alloc_cluster_offset(bs, acb->sector_num << 9,
|
640 | 7b88e48b | Christoph Hellwig | index_in_cluster, n_end, &acb->cur_nr_sectors, &acb->l2meta); |
641 | 148da7ea | Kevin Wolf | if (ret < 0) { |
642 | 148da7ea | Kevin Wolf | goto done;
|
643 | 148da7ea | Kevin Wolf | } |
644 | 148da7ea | Kevin Wolf | |
645 | 148da7ea | Kevin Wolf | acb->cluster_offset = acb->l2meta.cluster_offset; |
646 | f214978a | Kevin Wolf | |
647 | f214978a | Kevin Wolf | /* Need to wait for another request? If so, we are done for now. */
|
648 | 148da7ea | Kevin Wolf | if (acb->l2meta.nb_clusters == 0 && acb->l2meta.depends_on != NULL) { |
649 | 72cf2d4f | Blue Swirl | QLIST_INSERT_HEAD(&acb->l2meta.depends_on->dependent_requests, |
650 | f214978a | Kevin Wolf | acb, next_depend); |
651 | f214978a | Kevin Wolf | return;
|
652 | f214978a | Kevin Wolf | } |
653 | f214978a | Kevin Wolf | |
654 | 148da7ea | Kevin Wolf | assert((acb->cluster_offset & 511) == 0); |
655 | 148da7ea | Kevin Wolf | |
656 | 6f5f060b | Kevin Wolf | qemu_iovec_reset(&acb->hd_qiov); |
657 | 6f5f060b | Kevin Wolf | qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done, |
658 | 6f5f060b | Kevin Wolf | acb->cur_nr_sectors * 512);
|
659 | 6f5f060b | Kevin Wolf | |
660 | 585f8587 | bellard | if (s->crypt_method) {
|
661 | ce1a14dc | pbrook | if (!acb->cluster_data) {
|
662 | 095a9c58 | aliguori | acb->cluster_data = qemu_mallocz(QCOW_MAX_CRYPT_CLUSTERS * |
663 | 095a9c58 | aliguori | s->cluster_size); |
664 | 585f8587 | bellard | } |
665 | 6f5f060b | Kevin Wolf | |
666 | 6f5f060b | Kevin Wolf | assert(acb->hd_qiov.size <= QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
667 | 6f5f060b | Kevin Wolf | qemu_iovec_to_buffer(&acb->hd_qiov, acb->cluster_data); |
668 | 6f5f060b | Kevin Wolf | |
669 | 6f5f060b | Kevin Wolf | qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data, |
670 | 6f5f060b | Kevin Wolf | acb->cluster_data, acb->cur_nr_sectors, 1, &s->aes_encrypt_key);
|
671 | 6f5f060b | Kevin Wolf | |
672 | 6f5f060b | Kevin Wolf | qemu_iovec_reset(&acb->hd_qiov); |
673 | 6f5f060b | Kevin Wolf | qemu_iovec_add(&acb->hd_qiov, acb->cluster_data, |
674 | 6f5f060b | Kevin Wolf | acb->cur_nr_sectors * 512);
|
675 | 585f8587 | bellard | } |
676 | 6f5f060b | Kevin Wolf | |
677 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
678 | 66f82cee | Kevin Wolf | acb->hd_aiocb = bdrv_aio_writev(bs->file, |
679 | c87c0672 | aliguori | (acb->cluster_offset >> 9) + index_in_cluster,
|
680 | 7b88e48b | Christoph Hellwig | &acb->hd_qiov, acb->cur_nr_sectors, |
681 | 7c80ab3f | Jes Sorensen | qcow2_aio_write_cb, acb); |
682 | 171e3d6b | Kevin Wolf | if (acb->hd_aiocb == NULL) { |
683 | 171e3d6b | Kevin Wolf | ret = -EIO; |
684 | c644db3d | Kevin Wolf | goto fail;
|
685 | 171e3d6b | Kevin Wolf | } |
686 | f141eafe | aliguori | |
687 | f141eafe | aliguori | return;
|
688 | f141eafe | aliguori | |
689 | c644db3d | Kevin Wolf | fail:
|
690 | c644db3d | Kevin Wolf | if (acb->l2meta.nb_clusters != 0) { |
691 | c644db3d | Kevin Wolf | QLIST_REMOVE(&acb->l2meta, next_in_flight); |
692 | c644db3d | Kevin Wolf | } |
693 | f141eafe | aliguori | done:
|
694 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
695 | 6f5f060b | Kevin Wolf | qemu_iovec_destroy(&acb->hd_qiov); |
696 | f141eafe | aliguori | qemu_aio_release(acb); |
697 | 585f8587 | bellard | } |
698 | 585f8587 | bellard | |
699 | 7c80ab3f | Jes Sorensen | static BlockDriverAIOCB *qcow2_aio_writev(BlockDriverState *bs,
|
700 | 7c80ab3f | Jes Sorensen | int64_t sector_num, |
701 | 7c80ab3f | Jes Sorensen | QEMUIOVector *qiov, int nb_sectors,
|
702 | 7c80ab3f | Jes Sorensen | BlockDriverCompletionFunc *cb, |
703 | 7c80ab3f | Jes Sorensen | void *opaque)
|
704 | 585f8587 | bellard | { |
705 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
706 | ce1a14dc | pbrook | QCowAIOCB *acb; |
707 | 3b46e624 | ths | |
708 | 585f8587 | bellard | s->cluster_cache_offset = -1; /* disable compressed cache */ |
709 | 585f8587 | bellard | |
710 | 7c80ab3f | Jes Sorensen | acb = qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
711 | ce1a14dc | pbrook | if (!acb)
|
712 | ce1a14dc | pbrook | return NULL; |
713 | 3b46e624 | ths | |
714 | 7c80ab3f | Jes Sorensen | qcow2_aio_write_cb(acb, 0);
|
715 | ce1a14dc | pbrook | return &acb->common;
|
716 | 585f8587 | bellard | } |
717 | 585f8587 | bellard | |
718 | 7c80ab3f | Jes Sorensen | static void qcow2_close(BlockDriverState *bs) |
719 | 585f8587 | bellard | { |
720 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
721 | 585f8587 | bellard | qemu_free(s->l1_table); |
722 | 585f8587 | bellard | qemu_free(s->l2_cache); |
723 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
724 | 585f8587 | bellard | qemu_free(s->cluster_data); |
725 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
726 | 585f8587 | bellard | } |
727 | 585f8587 | bellard | |
728 | 756e6736 | Kevin Wolf | /*
|
729 | 756e6736 | Kevin Wolf | * Updates the variable length parts of the qcow2 header, i.e. the backing file
|
730 | 756e6736 | Kevin Wolf | * name and all extensions. qcow2 was not designed to allow such changes, so if
|
731 | 756e6736 | Kevin Wolf | * we run out of space (we can only use the first cluster) this function may
|
732 | 756e6736 | Kevin Wolf | * fail.
|
733 | 756e6736 | Kevin Wolf | *
|
734 | 756e6736 | Kevin Wolf | * Returns 0 on success, -errno in error cases.
|
735 | 756e6736 | Kevin Wolf | */
|
736 | 756e6736 | Kevin Wolf | static int qcow2_update_ext_header(BlockDriverState *bs, |
737 | 756e6736 | Kevin Wolf | const char *backing_file, const char *backing_fmt) |
738 | 756e6736 | Kevin Wolf | { |
739 | 756e6736 | Kevin Wolf | size_t backing_file_len = 0;
|
740 | 756e6736 | Kevin Wolf | size_t backing_fmt_len = 0;
|
741 | 756e6736 | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
742 | 756e6736 | Kevin Wolf | QCowExtension ext_backing_fmt = {0, 0}; |
743 | 756e6736 | Kevin Wolf | int ret;
|
744 | 756e6736 | Kevin Wolf | |
745 | 756e6736 | Kevin Wolf | /* Backing file format doesn't make sense without a backing file */
|
746 | 756e6736 | Kevin Wolf | if (backing_fmt && !backing_file) {
|
747 | 756e6736 | Kevin Wolf | return -EINVAL;
|
748 | 756e6736 | Kevin Wolf | } |
749 | 756e6736 | Kevin Wolf | |
750 | 756e6736 | Kevin Wolf | /* Prepare the backing file format extension if needed */
|
751 | 756e6736 | Kevin Wolf | if (backing_fmt) {
|
752 | 756e6736 | Kevin Wolf | ext_backing_fmt.len = cpu_to_be32(strlen(backing_fmt)); |
753 | 7c80ab3f | Jes Sorensen | ext_backing_fmt.magic = cpu_to_be32(QCOW2_EXT_MAGIC_BACKING_FORMAT); |
754 | 756e6736 | Kevin Wolf | backing_fmt_len = ((sizeof(ext_backing_fmt)
|
755 | 756e6736 | Kevin Wolf | + strlen(backing_fmt) + 7) & ~7); |
756 | 756e6736 | Kevin Wolf | } |
757 | 756e6736 | Kevin Wolf | |
758 | 756e6736 | Kevin Wolf | /* Check if we can fit the new header into the first cluster */
|
759 | 756e6736 | Kevin Wolf | if (backing_file) {
|
760 | 756e6736 | Kevin Wolf | backing_file_len = strlen(backing_file); |
761 | 756e6736 | Kevin Wolf | } |
762 | 756e6736 | Kevin Wolf | |
763 | 756e6736 | Kevin Wolf | size_t header_size = sizeof(QCowHeader) + backing_file_len
|
764 | 756e6736 | Kevin Wolf | + backing_fmt_len; |
765 | 756e6736 | Kevin Wolf | |
766 | 756e6736 | Kevin Wolf | if (header_size > s->cluster_size) {
|
767 | 756e6736 | Kevin Wolf | return -ENOSPC;
|
768 | 756e6736 | Kevin Wolf | } |
769 | 756e6736 | Kevin Wolf | |
770 | 756e6736 | Kevin Wolf | /* Rewrite backing file name and qcow2 extensions */
|
771 | 756e6736 | Kevin Wolf | size_t ext_size = header_size - sizeof(QCowHeader);
|
772 | 756e6736 | Kevin Wolf | uint8_t buf[ext_size]; |
773 | 756e6736 | Kevin Wolf | size_t offset = 0;
|
774 | 756e6736 | Kevin Wolf | size_t backing_file_offset = 0;
|
775 | 756e6736 | Kevin Wolf | |
776 | 756e6736 | Kevin Wolf | if (backing_file) {
|
777 | 756e6736 | Kevin Wolf | if (backing_fmt) {
|
778 | 756e6736 | Kevin Wolf | int padding = backing_fmt_len -
|
779 | 756e6736 | Kevin Wolf | (sizeof(ext_backing_fmt) + strlen(backing_fmt));
|
780 | 756e6736 | Kevin Wolf | |
781 | 756e6736 | Kevin Wolf | memcpy(buf + offset, &ext_backing_fmt, sizeof(ext_backing_fmt));
|
782 | 756e6736 | Kevin Wolf | offset += sizeof(ext_backing_fmt);
|
783 | 756e6736 | Kevin Wolf | |
784 | 756e6736 | Kevin Wolf | memcpy(buf + offset, backing_fmt, strlen(backing_fmt)); |
785 | 756e6736 | Kevin Wolf | offset += strlen(backing_fmt); |
786 | 756e6736 | Kevin Wolf | |
787 | 756e6736 | Kevin Wolf | memset(buf + offset, 0, padding);
|
788 | 756e6736 | Kevin Wolf | offset += padding; |
789 | 756e6736 | Kevin Wolf | } |
790 | 756e6736 | Kevin Wolf | |
791 | 756e6736 | Kevin Wolf | memcpy(buf + offset, backing_file, backing_file_len); |
792 | 756e6736 | Kevin Wolf | backing_file_offset = sizeof(QCowHeader) + offset;
|
793 | 756e6736 | Kevin Wolf | } |
794 | 756e6736 | Kevin Wolf | |
795 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, sizeof(QCowHeader), buf, ext_size);
|
796 | 756e6736 | Kevin Wolf | if (ret < 0) { |
797 | 756e6736 | Kevin Wolf | goto fail;
|
798 | 756e6736 | Kevin Wolf | } |
799 | 756e6736 | Kevin Wolf | |
800 | 756e6736 | Kevin Wolf | /* Update header fields */
|
801 | 756e6736 | Kevin Wolf | uint64_t be_backing_file_offset = cpu_to_be64(backing_file_offset); |
802 | 756e6736 | Kevin Wolf | uint32_t be_backing_file_size = cpu_to_be32(backing_file_len); |
803 | 756e6736 | Kevin Wolf | |
804 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_offset), |
805 | 756e6736 | Kevin Wolf | &be_backing_file_offset, sizeof(uint64_t));
|
806 | 756e6736 | Kevin Wolf | if (ret < 0) { |
807 | 756e6736 | Kevin Wolf | goto fail;
|
808 | 756e6736 | Kevin Wolf | } |
809 | 756e6736 | Kevin Wolf | |
810 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_size), |
811 | 756e6736 | Kevin Wolf | &be_backing_file_size, sizeof(uint32_t));
|
812 | 756e6736 | Kevin Wolf | if (ret < 0) { |
813 | 756e6736 | Kevin Wolf | goto fail;
|
814 | 756e6736 | Kevin Wolf | } |
815 | 756e6736 | Kevin Wolf | |
816 | 756e6736 | Kevin Wolf | ret = 0;
|
817 | 756e6736 | Kevin Wolf | fail:
|
818 | 756e6736 | Kevin Wolf | return ret;
|
819 | 756e6736 | Kevin Wolf | } |
820 | 756e6736 | Kevin Wolf | |
821 | 756e6736 | Kevin Wolf | static int qcow2_change_backing_file(BlockDriverState *bs, |
822 | 756e6736 | Kevin Wolf | const char *backing_file, const char *backing_fmt) |
823 | 756e6736 | Kevin Wolf | { |
824 | 756e6736 | Kevin Wolf | return qcow2_update_ext_header(bs, backing_file, backing_fmt);
|
825 | 756e6736 | Kevin Wolf | } |
826 | 756e6736 | Kevin Wolf | |
827 | a35e1c17 | Kevin Wolf | static int preallocate(BlockDriverState *bs) |
828 | a35e1c17 | Kevin Wolf | { |
829 | a35e1c17 | Kevin Wolf | uint64_t nb_sectors; |
830 | a35e1c17 | Kevin Wolf | uint64_t offset; |
831 | a35e1c17 | Kevin Wolf | int num;
|
832 | 148da7ea | Kevin Wolf | int ret;
|
833 | a35e1c17 | Kevin Wolf | QCowL2Meta meta; |
834 | a35e1c17 | Kevin Wolf | |
835 | a35e1c17 | Kevin Wolf | nb_sectors = bdrv_getlength(bs) >> 9;
|
836 | a35e1c17 | Kevin Wolf | offset = 0;
|
837 | 72cf2d4f | Blue Swirl | QLIST_INIT(&meta.dependent_requests); |
838 | 148da7ea | Kevin Wolf | meta.cluster_offset = 0;
|
839 | a35e1c17 | Kevin Wolf | |
840 | a35e1c17 | Kevin Wolf | while (nb_sectors) {
|
841 | a35e1c17 | Kevin Wolf | num = MIN(nb_sectors, INT_MAX >> 9);
|
842 | 148da7ea | Kevin Wolf | ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta);
|
843 | 148da7ea | Kevin Wolf | if (ret < 0) { |
844 | 19dbcbf7 | Kevin Wolf | return ret;
|
845 | a35e1c17 | Kevin Wolf | } |
846 | a35e1c17 | Kevin Wolf | |
847 | 19dbcbf7 | Kevin Wolf | ret = qcow2_alloc_cluster_link_l2(bs, &meta); |
848 | 19dbcbf7 | Kevin Wolf | if (ret < 0) { |
849 | 148da7ea | Kevin Wolf | qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); |
850 | 19dbcbf7 | Kevin Wolf | return ret;
|
851 | a35e1c17 | Kevin Wolf | } |
852 | a35e1c17 | Kevin Wolf | |
853 | f214978a | Kevin Wolf | /* There are no dependent requests, but we need to remove our request
|
854 | f214978a | Kevin Wolf | * from the list of in-flight requests */
|
855 | f214978a | Kevin Wolf | run_dependent_requests(&meta); |
856 | f214978a | Kevin Wolf | |
857 | a35e1c17 | Kevin Wolf | /* TODO Preallocate data if requested */
|
858 | a35e1c17 | Kevin Wolf | |
859 | a35e1c17 | Kevin Wolf | nb_sectors -= num; |
860 | a35e1c17 | Kevin Wolf | offset += num << 9;
|
861 | a35e1c17 | Kevin Wolf | } |
862 | a35e1c17 | Kevin Wolf | |
863 | a35e1c17 | Kevin Wolf | /*
|
864 | a35e1c17 | Kevin Wolf | * It is expected that the image file is large enough to actually contain
|
865 | a35e1c17 | Kevin Wolf | * all of the allocated clusters (otherwise we get failing reads after
|
866 | a35e1c17 | Kevin Wolf | * EOF). Extend the image to the last allocated sector.
|
867 | a35e1c17 | Kevin Wolf | */
|
868 | 148da7ea | Kevin Wolf | if (meta.cluster_offset != 0) { |
869 | ea80b906 | Kevin Wolf | uint8_t buf[512];
|
870 | ea80b906 | Kevin Wolf | memset(buf, 0, 512); |
871 | 19dbcbf7 | Kevin Wolf | ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); |
872 | 19dbcbf7 | Kevin Wolf | if (ret < 0) { |
873 | 19dbcbf7 | Kevin Wolf | return ret;
|
874 | 19dbcbf7 | Kevin Wolf | } |
875 | a35e1c17 | Kevin Wolf | } |
876 | a35e1c17 | Kevin Wolf | |
877 | a35e1c17 | Kevin Wolf | return 0; |
878 | a35e1c17 | Kevin Wolf | } |
879 | a35e1c17 | Kevin Wolf | |
880 | 7c80ab3f | Jes Sorensen | static int qcow2_create2(const char *filename, int64_t total_size, |
881 | 7c80ab3f | Jes Sorensen | const char *backing_file, const char *backing_format, |
882 | 7c80ab3f | Jes Sorensen | int flags, size_t cluster_size, int prealloc, |
883 | 7c80ab3f | Jes Sorensen | QEMUOptionParameter *options) |
884 | a9420734 | Kevin Wolf | { |
885 | a9420734 | Kevin Wolf | /* Calulate cluster_bits */
|
886 | a9420734 | Kevin Wolf | int cluster_bits;
|
887 | a9420734 | Kevin Wolf | cluster_bits = ffs(cluster_size) - 1;
|
888 | a9420734 | Kevin Wolf | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS ||
|
889 | a9420734 | Kevin Wolf | (1 << cluster_bits) != cluster_size)
|
890 | a9420734 | Kevin Wolf | { |
891 | a9420734 | Kevin Wolf | error_report( |
892 | a9420734 | Kevin Wolf | "Cluster size must be a power of two between %d and %dk\n",
|
893 | a9420734 | Kevin Wolf | 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); |
894 | a9420734 | Kevin Wolf | return -EINVAL;
|
895 | a9420734 | Kevin Wolf | } |
896 | a9420734 | Kevin Wolf | |
897 | a9420734 | Kevin Wolf | /*
|
898 | a9420734 | Kevin Wolf | * Open the image file and write a minimal qcow2 header.
|
899 | a9420734 | Kevin Wolf | *
|
900 | a9420734 | Kevin Wolf | * We keep things simple and start with a zero-sized image. We also
|
901 | a9420734 | Kevin Wolf | * do without refcount blocks or a L1 table for now. We'll fix the
|
902 | a9420734 | Kevin Wolf | * inconsistency later.
|
903 | a9420734 | Kevin Wolf | *
|
904 | a9420734 | Kevin Wolf | * We do need a refcount table because growing the refcount table means
|
905 | a9420734 | Kevin Wolf | * allocating two new refcount blocks - the seconds of which would be at
|
906 | a9420734 | Kevin Wolf | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file
|
907 | a9420734 | Kevin Wolf | * size for any qcow2 image.
|
908 | a9420734 | Kevin Wolf | */
|
909 | a9420734 | Kevin Wolf | BlockDriverState* bs; |
910 | a9420734 | Kevin Wolf | QCowHeader header; |
911 | a9420734 | Kevin Wolf | uint8_t* refcount_table; |
912 | a9420734 | Kevin Wolf | int ret;
|
913 | a9420734 | Kevin Wolf | |
914 | a9420734 | Kevin Wolf | ret = bdrv_create_file(filename, options); |
915 | a9420734 | Kevin Wolf | if (ret < 0) { |
916 | a9420734 | Kevin Wolf | return ret;
|
917 | a9420734 | Kevin Wolf | } |
918 | a9420734 | Kevin Wolf | |
919 | a9420734 | Kevin Wolf | ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR); |
920 | a9420734 | Kevin Wolf | if (ret < 0) { |
921 | a9420734 | Kevin Wolf | return ret;
|
922 | a9420734 | Kevin Wolf | } |
923 | a9420734 | Kevin Wolf | |
924 | a9420734 | Kevin Wolf | /* Write the header */
|
925 | a9420734 | Kevin Wolf | memset(&header, 0, sizeof(header)); |
926 | a9420734 | Kevin Wolf | header.magic = cpu_to_be32(QCOW_MAGIC); |
927 | a9420734 | Kevin Wolf | header.version = cpu_to_be32(QCOW_VERSION); |
928 | a9420734 | Kevin Wolf | header.cluster_bits = cpu_to_be32(cluster_bits); |
929 | a9420734 | Kevin Wolf | header.size = cpu_to_be64(0);
|
930 | a9420734 | Kevin Wolf | header.l1_table_offset = cpu_to_be64(0);
|
931 | a9420734 | Kevin Wolf | header.l1_size = cpu_to_be32(0);
|
932 | a9420734 | Kevin Wolf | header.refcount_table_offset = cpu_to_be64(cluster_size); |
933 | a9420734 | Kevin Wolf | header.refcount_table_clusters = cpu_to_be32(1);
|
934 | a9420734 | Kevin Wolf | |
935 | a9420734 | Kevin Wolf | if (flags & BLOCK_FLAG_ENCRYPT) {
|
936 | a9420734 | Kevin Wolf | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
937 | a9420734 | Kevin Wolf | } else {
|
938 | a9420734 | Kevin Wolf | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
939 | a9420734 | Kevin Wolf | } |
940 | a9420734 | Kevin Wolf | |
941 | a9420734 | Kevin Wolf | ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); |
942 | a9420734 | Kevin Wolf | if (ret < 0) { |
943 | a9420734 | Kevin Wolf | goto out;
|
944 | a9420734 | Kevin Wolf | } |
945 | a9420734 | Kevin Wolf | |
946 | a9420734 | Kevin Wolf | /* Write an empty refcount table */
|
947 | a9420734 | Kevin Wolf | refcount_table = qemu_mallocz(cluster_size); |
948 | a9420734 | Kevin Wolf | ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); |
949 | a9420734 | Kevin Wolf | qemu_free(refcount_table); |
950 | a9420734 | Kevin Wolf | |
951 | a9420734 | Kevin Wolf | if (ret < 0) { |
952 | a9420734 | Kevin Wolf | goto out;
|
953 | a9420734 | Kevin Wolf | } |
954 | a9420734 | Kevin Wolf | |
955 | a9420734 | Kevin Wolf | bdrv_close(bs); |
956 | a9420734 | Kevin Wolf | |
957 | a9420734 | Kevin Wolf | /*
|
958 | a9420734 | Kevin Wolf | * And now open the image and make it consistent first (i.e. increase the
|
959 | a9420734 | Kevin Wolf | * refcount of the cluster that is occupied by the header and the refcount
|
960 | a9420734 | Kevin Wolf | * table)
|
961 | a9420734 | Kevin Wolf | */
|
962 | a9420734 | Kevin Wolf | BlockDriver* drv = bdrv_find_format("qcow2");
|
963 | a9420734 | Kevin Wolf | assert(drv != NULL);
|
964 | a9420734 | Kevin Wolf | ret = bdrv_open(bs, filename, BDRV_O_RDWR | BDRV_O_NO_FLUSH, drv); |
965 | a9420734 | Kevin Wolf | if (ret < 0) { |
966 | a9420734 | Kevin Wolf | goto out;
|
967 | a9420734 | Kevin Wolf | } |
968 | a9420734 | Kevin Wolf | |
969 | a9420734 | Kevin Wolf | ret = qcow2_alloc_clusters(bs, 2 * cluster_size);
|
970 | a9420734 | Kevin Wolf | if (ret < 0) { |
971 | a9420734 | Kevin Wolf | goto out;
|
972 | a9420734 | Kevin Wolf | |
973 | a9420734 | Kevin Wolf | } else if (ret != 0) { |
974 | a9420734 | Kevin Wolf | error_report("Huh, first cluster in empty image is already in use?");
|
975 | a9420734 | Kevin Wolf | abort(); |
976 | a9420734 | Kevin Wolf | } |
977 | a9420734 | Kevin Wolf | |
978 | a9420734 | Kevin Wolf | /* Okay, now that we have a valid image, let's give it the right size */
|
979 | a9420734 | Kevin Wolf | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); |
980 | a9420734 | Kevin Wolf | if (ret < 0) { |
981 | a9420734 | Kevin Wolf | goto out;
|
982 | a9420734 | Kevin Wolf | } |
983 | a9420734 | Kevin Wolf | |
984 | a9420734 | Kevin Wolf | /* Want a backing file? There you go.*/
|
985 | a9420734 | Kevin Wolf | if (backing_file) {
|
986 | a9420734 | Kevin Wolf | ret = bdrv_change_backing_file(bs, backing_file, backing_format); |
987 | a9420734 | Kevin Wolf | if (ret < 0) { |
988 | a9420734 | Kevin Wolf | goto out;
|
989 | a9420734 | Kevin Wolf | } |
990 | a9420734 | Kevin Wolf | } |
991 | a9420734 | Kevin Wolf | |
992 | a9420734 | Kevin Wolf | /* And if we're supposed to preallocate metadata, do that now */
|
993 | a9420734 | Kevin Wolf | if (prealloc) {
|
994 | a9420734 | Kevin Wolf | ret = preallocate(bs); |
995 | a9420734 | Kevin Wolf | if (ret < 0) { |
996 | a9420734 | Kevin Wolf | goto out;
|
997 | a9420734 | Kevin Wolf | } |
998 | a9420734 | Kevin Wolf | } |
999 | a9420734 | Kevin Wolf | |
1000 | a9420734 | Kevin Wolf | ret = 0;
|
1001 | a9420734 | Kevin Wolf | out:
|
1002 | a9420734 | Kevin Wolf | bdrv_delete(bs); |
1003 | a9420734 | Kevin Wolf | return ret;
|
1004 | a9420734 | Kevin Wolf | } |
1005 | de5f3f40 | Kevin Wolf | |
1006 | 7c80ab3f | Jes Sorensen | static int qcow2_create(const char *filename, QEMUOptionParameter *options) |
1007 | de5f3f40 | Kevin Wolf | { |
1008 | de5f3f40 | Kevin Wolf | const char *backing_file = NULL; |
1009 | de5f3f40 | Kevin Wolf | const char *backing_fmt = NULL; |
1010 | de5f3f40 | Kevin Wolf | uint64_t sectors = 0;
|
1011 | de5f3f40 | Kevin Wolf | int flags = 0; |
1012 | de5f3f40 | Kevin Wolf | size_t cluster_size = 65536;
|
1013 | de5f3f40 | Kevin Wolf | int prealloc = 0; |
1014 | de5f3f40 | Kevin Wolf | |
1015 | de5f3f40 | Kevin Wolf | /* Read out options */
|
1016 | de5f3f40 | Kevin Wolf | while (options && options->name) {
|
1017 | de5f3f40 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1018 | de5f3f40 | Kevin Wolf | sectors = options->value.n / 512;
|
1019 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1020 | de5f3f40 | Kevin Wolf | backing_file = options->value.s; |
1021 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { |
1022 | de5f3f40 | Kevin Wolf | backing_fmt = options->value.s; |
1023 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
1024 | de5f3f40 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
1025 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
1026 | de5f3f40 | Kevin Wolf | if (options->value.n) {
|
1027 | de5f3f40 | Kevin Wolf | cluster_size = options->value.n; |
1028 | de5f3f40 | Kevin Wolf | } |
1029 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { |
1030 | de5f3f40 | Kevin Wolf | if (!options->value.s || !strcmp(options->value.s, "off")) { |
1031 | de5f3f40 | Kevin Wolf | prealloc = 0;
|
1032 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->value.s, "metadata")) { |
1033 | de5f3f40 | Kevin Wolf | prealloc = 1;
|
1034 | de5f3f40 | Kevin Wolf | } else {
|
1035 | de5f3f40 | Kevin Wolf | fprintf(stderr, "Invalid preallocation mode: '%s'\n",
|
1036 | de5f3f40 | Kevin Wolf | options->value.s); |
1037 | de5f3f40 | Kevin Wolf | return -EINVAL;
|
1038 | de5f3f40 | Kevin Wolf | } |
1039 | de5f3f40 | Kevin Wolf | } |
1040 | de5f3f40 | Kevin Wolf | options++; |
1041 | de5f3f40 | Kevin Wolf | } |
1042 | de5f3f40 | Kevin Wolf | |
1043 | de5f3f40 | Kevin Wolf | if (backing_file && prealloc) {
|
1044 | de5f3f40 | Kevin Wolf | fprintf(stderr, "Backing file and preallocation cannot be used at "
|
1045 | de5f3f40 | Kevin Wolf | "the same time\n");
|
1046 | de5f3f40 | Kevin Wolf | return -EINVAL;
|
1047 | de5f3f40 | Kevin Wolf | } |
1048 | de5f3f40 | Kevin Wolf | |
1049 | 7c80ab3f | Jes Sorensen | return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags,
|
1050 | 7c80ab3f | Jes Sorensen | cluster_size, prealloc, options); |
1051 | de5f3f40 | Kevin Wolf | } |
1052 | de5f3f40 | Kevin Wolf | |
1053 | 7c80ab3f | Jes Sorensen | static int qcow2_make_empty(BlockDriverState *bs) |
1054 | 20d97356 | Blue Swirl | { |
1055 | 20d97356 | Blue Swirl | #if 0
|
1056 | 20d97356 | Blue Swirl | /* XXX: not correct */
|
1057 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque;
|
1058 | 20d97356 | Blue Swirl | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
1059 | 20d97356 | Blue Swirl | int ret;
|
1060 | 20d97356 | Blue Swirl | |
1061 | 20d97356 | Blue Swirl | memset(s->l1_table, 0, l1_length);
|
1062 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0)
|
1063 | 20d97356 | Blue Swirl | return -1;
|
1064 | 66f82cee | Kevin Wolf | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length);
|
1065 | 20d97356 | Blue Swirl | if (ret < 0)
|
1066 | 20d97356 | Blue Swirl | return ret;
|
1067 | 20d97356 | Blue Swirl | |
1068 | 20d97356 | Blue Swirl | l2_cache_reset(bs);
|
1069 | 20d97356 | Blue Swirl | #endif
|
1070 | 20d97356 | Blue Swirl | return 0; |
1071 | 20d97356 | Blue Swirl | } |
1072 | 20d97356 | Blue Swirl | |
1073 | 419b19d9 | Stefan Hajnoczi | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1074 | 419b19d9 | Stefan Hajnoczi | { |
1075 | 419b19d9 | Stefan Hajnoczi | BDRVQcowState *s = bs->opaque; |
1076 | 419b19d9 | Stefan Hajnoczi | int ret, new_l1_size;
|
1077 | 419b19d9 | Stefan Hajnoczi | |
1078 | 419b19d9 | Stefan Hajnoczi | if (offset & 511) { |
1079 | 419b19d9 | Stefan Hajnoczi | return -EINVAL;
|
1080 | 419b19d9 | Stefan Hajnoczi | } |
1081 | 419b19d9 | Stefan Hajnoczi | |
1082 | 419b19d9 | Stefan Hajnoczi | /* cannot proceed if image has snapshots */
|
1083 | 419b19d9 | Stefan Hajnoczi | if (s->nb_snapshots) {
|
1084 | 419b19d9 | Stefan Hajnoczi | return -ENOTSUP;
|
1085 | 419b19d9 | Stefan Hajnoczi | } |
1086 | 419b19d9 | Stefan Hajnoczi | |
1087 | 419b19d9 | Stefan Hajnoczi | /* shrinking is currently not supported */
|
1088 | 419b19d9 | Stefan Hajnoczi | if (offset < bs->total_sectors * 512) { |
1089 | 419b19d9 | Stefan Hajnoczi | return -ENOTSUP;
|
1090 | 419b19d9 | Stefan Hajnoczi | } |
1091 | 419b19d9 | Stefan Hajnoczi | |
1092 | 419b19d9 | Stefan Hajnoczi | new_l1_size = size_to_l1(s, offset); |
1093 | 72893756 | Stefan Hajnoczi | ret = qcow2_grow_l1_table(bs, new_l1_size, true);
|
1094 | 419b19d9 | Stefan Hajnoczi | if (ret < 0) { |
1095 | 419b19d9 | Stefan Hajnoczi | return ret;
|
1096 | 419b19d9 | Stefan Hajnoczi | } |
1097 | 419b19d9 | Stefan Hajnoczi | |
1098 | 419b19d9 | Stefan Hajnoczi | /* write updated header.size */
|
1099 | 419b19d9 | Stefan Hajnoczi | offset = cpu_to_be64(offset); |
1100 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1101 | 8b3b7206 | Kevin Wolf | &offset, sizeof(uint64_t));
|
1102 | 419b19d9 | Stefan Hajnoczi | if (ret < 0) { |
1103 | 419b19d9 | Stefan Hajnoczi | return ret;
|
1104 | 419b19d9 | Stefan Hajnoczi | } |
1105 | 419b19d9 | Stefan Hajnoczi | |
1106 | 419b19d9 | Stefan Hajnoczi | s->l1_vm_state_index = new_l1_size; |
1107 | 419b19d9 | Stefan Hajnoczi | return 0; |
1108 | 419b19d9 | Stefan Hajnoczi | } |
1109 | 419b19d9 | Stefan Hajnoczi | |
1110 | 20d97356 | Blue Swirl | /* XXX: put compressed sectors first, then all the cluster aligned
|
1111 | 20d97356 | Blue Swirl | tables to avoid losing bytes in alignment */
|
1112 | 7c80ab3f | Jes Sorensen | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1113 | 7c80ab3f | Jes Sorensen | const uint8_t *buf, int nb_sectors) |
1114 | 20d97356 | Blue Swirl | { |
1115 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1116 | 20d97356 | Blue Swirl | z_stream strm; |
1117 | 20d97356 | Blue Swirl | int ret, out_len;
|
1118 | 20d97356 | Blue Swirl | uint8_t *out_buf; |
1119 | 20d97356 | Blue Swirl | uint64_t cluster_offset; |
1120 | 20d97356 | Blue Swirl | |
1121 | 20d97356 | Blue Swirl | if (nb_sectors == 0) { |
1122 | 20d97356 | Blue Swirl | /* align end of file to a sector boundary to ease reading with
|
1123 | 20d97356 | Blue Swirl | sector based I/Os */
|
1124 | 66f82cee | Kevin Wolf | cluster_offset = bdrv_getlength(bs->file); |
1125 | 20d97356 | Blue Swirl | cluster_offset = (cluster_offset + 511) & ~511; |
1126 | 66f82cee | Kevin Wolf | bdrv_truncate(bs->file, cluster_offset); |
1127 | 20d97356 | Blue Swirl | return 0; |
1128 | 20d97356 | Blue Swirl | } |
1129 | 20d97356 | Blue Swirl | |
1130 | 20d97356 | Blue Swirl | if (nb_sectors != s->cluster_sectors)
|
1131 | 20d97356 | Blue Swirl | return -EINVAL;
|
1132 | 20d97356 | Blue Swirl | |
1133 | 20d97356 | Blue Swirl | out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
1134 | 20d97356 | Blue Swirl | |
1135 | 20d97356 | Blue Swirl | /* best compression, small window, no zlib header */
|
1136 | 20d97356 | Blue Swirl | memset(&strm, 0, sizeof(strm)); |
1137 | 20d97356 | Blue Swirl | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
1138 | 20d97356 | Blue Swirl | Z_DEFLATED, -12,
|
1139 | 20d97356 | Blue Swirl | 9, Z_DEFAULT_STRATEGY);
|
1140 | 20d97356 | Blue Swirl | if (ret != 0) { |
1141 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1142 | 20d97356 | Blue Swirl | return -1; |
1143 | 20d97356 | Blue Swirl | } |
1144 | 20d97356 | Blue Swirl | |
1145 | 20d97356 | Blue Swirl | strm.avail_in = s->cluster_size; |
1146 | 20d97356 | Blue Swirl | strm.next_in = (uint8_t *)buf; |
1147 | 20d97356 | Blue Swirl | strm.avail_out = s->cluster_size; |
1148 | 20d97356 | Blue Swirl | strm.next_out = out_buf; |
1149 | 20d97356 | Blue Swirl | |
1150 | 20d97356 | Blue Swirl | ret = deflate(&strm, Z_FINISH); |
1151 | 20d97356 | Blue Swirl | if (ret != Z_STREAM_END && ret != Z_OK) {
|
1152 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1153 | 20d97356 | Blue Swirl | deflateEnd(&strm); |
1154 | 20d97356 | Blue Swirl | return -1; |
1155 | 20d97356 | Blue Swirl | } |
1156 | 20d97356 | Blue Swirl | out_len = strm.next_out - out_buf; |
1157 | 20d97356 | Blue Swirl | |
1158 | 20d97356 | Blue Swirl | deflateEnd(&strm); |
1159 | 20d97356 | Blue Swirl | |
1160 | 20d97356 | Blue Swirl | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
1161 | 20d97356 | Blue Swirl | /* could not compress: write normal cluster */
|
1162 | 20d97356 | Blue Swirl | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1163 | 20d97356 | Blue Swirl | } else {
|
1164 | 20d97356 | Blue Swirl | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, |
1165 | 20d97356 | Blue Swirl | sector_num << 9, out_len);
|
1166 | 20d97356 | Blue Swirl | if (!cluster_offset)
|
1167 | 20d97356 | Blue Swirl | return -1; |
1168 | 20d97356 | Blue Swirl | cluster_offset &= s->cluster_offset_mask; |
1169 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
1170 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) {
|
1171 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1172 | 20d97356 | Blue Swirl | return -1; |
1173 | 20d97356 | Blue Swirl | } |
1174 | 20d97356 | Blue Swirl | } |
1175 | 20d97356 | Blue Swirl | |
1176 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1177 | 20d97356 | Blue Swirl | return 0; |
1178 | 20d97356 | Blue Swirl | } |
1179 | 20d97356 | Blue Swirl | |
1180 | 7c80ab3f | Jes Sorensen | static int qcow2_flush(BlockDriverState *bs) |
1181 | 20d97356 | Blue Swirl | { |
1182 | 205ef796 | Kevin Wolf | return bdrv_flush(bs->file);
|
1183 | 20d97356 | Blue Swirl | } |
1184 | 20d97356 | Blue Swirl | |
1185 | 7c80ab3f | Jes Sorensen | static BlockDriverAIOCB *qcow2_aio_flush(BlockDriverState *bs,
|
1186 | 7c80ab3f | Jes Sorensen | BlockDriverCompletionFunc *cb, |
1187 | 7c80ab3f | Jes Sorensen | void *opaque)
|
1188 | 20d97356 | Blue Swirl | { |
1189 | 66f82cee | Kevin Wolf | return bdrv_aio_flush(bs->file, cb, opaque);
|
1190 | 20d97356 | Blue Swirl | } |
1191 | 20d97356 | Blue Swirl | |
1192 | 7c80ab3f | Jes Sorensen | static int64_t qcow2_vm_state_offset(BDRVQcowState *s)
|
1193 | 20d97356 | Blue Swirl | { |
1194 | 20d97356 | Blue Swirl | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
|
1195 | 20d97356 | Blue Swirl | } |
1196 | 20d97356 | Blue Swirl | |
1197 | 7c80ab3f | Jes Sorensen | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1198 | 20d97356 | Blue Swirl | { |
1199 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1200 | 20d97356 | Blue Swirl | bdi->cluster_size = s->cluster_size; |
1201 | 7c80ab3f | Jes Sorensen | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
1202 | 20d97356 | Blue Swirl | return 0; |
1203 | 20d97356 | Blue Swirl | } |
1204 | 20d97356 | Blue Swirl | |
1205 | 20d97356 | Blue Swirl | |
1206 | 7c80ab3f | Jes Sorensen | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result) |
1207 | 20d97356 | Blue Swirl | { |
1208 | 9ac228e0 | Kevin Wolf | return qcow2_check_refcounts(bs, result);
|
1209 | 20d97356 | Blue Swirl | } |
1210 | 20d97356 | Blue Swirl | |
1211 | 20d97356 | Blue Swirl | #if 0
|
1212 | 20d97356 | Blue Swirl | static void dump_refcounts(BlockDriverState *bs)
|
1213 | 20d97356 | Blue Swirl | {
|
1214 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque;
|
1215 | 20d97356 | Blue Swirl | int64_t nb_clusters, k, k1, size;
|
1216 | 20d97356 | Blue Swirl | int refcount;
|
1217 | 20d97356 | Blue Swirl | |
1218 | 66f82cee | Kevin Wolf | size = bdrv_getlength(bs->file);
|
1219 | 20d97356 | Blue Swirl | nb_clusters = size_to_clusters(s, size);
|
1220 | 20d97356 | Blue Swirl | for(k = 0; k < nb_clusters;) {
|
1221 | 20d97356 | Blue Swirl | k1 = k;
|
1222 | 20d97356 | Blue Swirl | refcount = get_refcount(bs, k);
|
1223 | 20d97356 | Blue Swirl | k++;
|
1224 | 20d97356 | Blue Swirl | while (k < nb_clusters && get_refcount(bs, k) == refcount)
|
1225 | 20d97356 | Blue Swirl | k++;
|
1226 | 0bfcd599 | Blue Swirl | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount,
|
1227 | 0bfcd599 | Blue Swirl | k - k1);
|
1228 | 20d97356 | Blue Swirl | }
|
1229 | 20d97356 | Blue Swirl | }
|
1230 | 20d97356 | Blue Swirl | #endif
|
1231 | 20d97356 | Blue Swirl | |
1232 | 7c80ab3f | Jes Sorensen | static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1233 | 7c80ab3f | Jes Sorensen | int64_t pos, int size)
|
1234 | 20d97356 | Blue Swirl | { |
1235 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1236 | 20d97356 | Blue Swirl | int growable = bs->growable;
|
1237 | 20d97356 | Blue Swirl | int ret;
|
1238 | 20d97356 | Blue Swirl | |
1239 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
1240 | 20d97356 | Blue Swirl | bs->growable = 1;
|
1241 | 7c80ab3f | Jes Sorensen | ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
1242 | 20d97356 | Blue Swirl | bs->growable = growable; |
1243 | 20d97356 | Blue Swirl | |
1244 | 20d97356 | Blue Swirl | return ret;
|
1245 | 20d97356 | Blue Swirl | } |
1246 | 20d97356 | Blue Swirl | |
1247 | 7c80ab3f | Jes Sorensen | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1248 | 7c80ab3f | Jes Sorensen | int64_t pos, int size)
|
1249 | 20d97356 | Blue Swirl | { |
1250 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1251 | 20d97356 | Blue Swirl | int growable = bs->growable;
|
1252 | 20d97356 | Blue Swirl | int ret;
|
1253 | 20d97356 | Blue Swirl | |
1254 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
1255 | 20d97356 | Blue Swirl | bs->growable = 1;
|
1256 | 7c80ab3f | Jes Sorensen | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
1257 | 20d97356 | Blue Swirl | bs->growable = growable; |
1258 | 20d97356 | Blue Swirl | |
1259 | 20d97356 | Blue Swirl | return ret;
|
1260 | 20d97356 | Blue Swirl | } |
1261 | 20d97356 | Blue Swirl | |
1262 | 7c80ab3f | Jes Sorensen | static QEMUOptionParameter qcow2_create_options[] = {
|
1263 | 20d97356 | Blue Swirl | { |
1264 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_SIZE, |
1265 | 20d97356 | Blue Swirl | .type = OPT_SIZE, |
1266 | 20d97356 | Blue Swirl | .help = "Virtual disk size"
|
1267 | 20d97356 | Blue Swirl | }, |
1268 | 20d97356 | Blue Swirl | { |
1269 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_BACKING_FILE, |
1270 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
1271 | 20d97356 | Blue Swirl | .help = "File name of a base image"
|
1272 | 20d97356 | Blue Swirl | }, |
1273 | 20d97356 | Blue Swirl | { |
1274 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_BACKING_FMT, |
1275 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
1276 | 20d97356 | Blue Swirl | .help = "Image format of the base image"
|
1277 | 20d97356 | Blue Swirl | }, |
1278 | 20d97356 | Blue Swirl | { |
1279 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_ENCRYPT, |
1280 | 20d97356 | Blue Swirl | .type = OPT_FLAG, |
1281 | 20d97356 | Blue Swirl | .help = "Encrypt the image"
|
1282 | 20d97356 | Blue Swirl | }, |
1283 | 20d97356 | Blue Swirl | { |
1284 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_CLUSTER_SIZE, |
1285 | 20d97356 | Blue Swirl | .type = OPT_SIZE, |
1286 | 20d97356 | Blue Swirl | .help = "qcow2 cluster size"
|
1287 | 20d97356 | Blue Swirl | }, |
1288 | 20d97356 | Blue Swirl | { |
1289 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_PREALLOC, |
1290 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
1291 | 20d97356 | Blue Swirl | .help = "Preallocation mode (allowed values: off, metadata)"
|
1292 | 20d97356 | Blue Swirl | }, |
1293 | 20d97356 | Blue Swirl | { NULL }
|
1294 | 20d97356 | Blue Swirl | }; |
1295 | 20d97356 | Blue Swirl | |
1296 | 20d97356 | Blue Swirl | static BlockDriver bdrv_qcow2 = {
|
1297 | 7c80ab3f | Jes Sorensen | .format_name = "qcow2",
|
1298 | 7c80ab3f | Jes Sorensen | .instance_size = sizeof(BDRVQcowState),
|
1299 | 7c80ab3f | Jes Sorensen | .bdrv_probe = qcow2_probe, |
1300 | 7c80ab3f | Jes Sorensen | .bdrv_open = qcow2_open, |
1301 | 7c80ab3f | Jes Sorensen | .bdrv_close = qcow2_close, |
1302 | 7c80ab3f | Jes Sorensen | .bdrv_create = qcow2_create, |
1303 | 7c80ab3f | Jes Sorensen | .bdrv_flush = qcow2_flush, |
1304 | 7c80ab3f | Jes Sorensen | .bdrv_is_allocated = qcow2_is_allocated, |
1305 | 7c80ab3f | Jes Sorensen | .bdrv_set_key = qcow2_set_key, |
1306 | 7c80ab3f | Jes Sorensen | .bdrv_make_empty = qcow2_make_empty, |
1307 | 7c80ab3f | Jes Sorensen | |
1308 | 7c80ab3f | Jes Sorensen | .bdrv_aio_readv = qcow2_aio_readv, |
1309 | 7c80ab3f | Jes Sorensen | .bdrv_aio_writev = qcow2_aio_writev, |
1310 | 7c80ab3f | Jes Sorensen | .bdrv_aio_flush = qcow2_aio_flush, |
1311 | 419b19d9 | Stefan Hajnoczi | |
1312 | 419b19d9 | Stefan Hajnoczi | .bdrv_truncate = qcow2_truncate, |
1313 | 7c80ab3f | Jes Sorensen | .bdrv_write_compressed = qcow2_write_compressed, |
1314 | 20d97356 | Blue Swirl | |
1315 | 20d97356 | Blue Swirl | .bdrv_snapshot_create = qcow2_snapshot_create, |
1316 | 20d97356 | Blue Swirl | .bdrv_snapshot_goto = qcow2_snapshot_goto, |
1317 | 20d97356 | Blue Swirl | .bdrv_snapshot_delete = qcow2_snapshot_delete, |
1318 | 20d97356 | Blue Swirl | .bdrv_snapshot_list = qcow2_snapshot_list, |
1319 | 51ef6727 | edison | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
1320 | 7c80ab3f | Jes Sorensen | .bdrv_get_info = qcow2_get_info, |
1321 | 20d97356 | Blue Swirl | |
1322 | 7c80ab3f | Jes Sorensen | .bdrv_save_vmstate = qcow2_save_vmstate, |
1323 | 7c80ab3f | Jes Sorensen | .bdrv_load_vmstate = qcow2_load_vmstate, |
1324 | 20d97356 | Blue Swirl | |
1325 | 20d97356 | Blue Swirl | .bdrv_change_backing_file = qcow2_change_backing_file, |
1326 | 20d97356 | Blue Swirl | |
1327 | 7c80ab3f | Jes Sorensen | .create_options = qcow2_create_options, |
1328 | 7c80ab3f | Jes Sorensen | .bdrv_check = qcow2_check, |
1329 | 20d97356 | Blue Swirl | }; |
1330 | 20d97356 | Blue Swirl | |
1331 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow2_init(void) |
1332 | 5efa9d5a | Anthony Liguori | { |
1333 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow2); |
1334 | 5efa9d5a | Anthony Liguori | } |
1335 | 5efa9d5a | Anthony Liguori | |
1336 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow2_init); |